Eichaed s



(No Model.)

R. S. WILLIAMS.

DENTAL POIL. f No. 375,241. Patented Deo. 20, 1887.

VUNITED STATES PATENT OFFICE.

RICHARD S. \VILLIAMS,`OF NEW YORK, N. Y.

DENTAL FOIL.

SPECIFICATION forming part of Letters Patent No. 375,241, dated December 20, 1887.

Application filed February 1S, 1886. Serial No. 192,3911

To all whom it may concern:

Be it known that I, RICHARD S. WILLIAMs, of the city, county, and State of New York, have invented a certain new and useful Improvement iu Gold for Dental Purposes, of which I declare the following to beafull, clear, and exact specification, reference being had to the accompanying drawings, forming apart thereof.

` rlhis invention has for its object an improvement in gold for dental purposes; and the invention consists in the combination of dental foil with gold precipitate, as is with particularity hereinafter shown, described, and claimed. v

In the accompanying sheet of drawings,Fig ure l is a plan View ot' foil; Fig. 2,a plan view ot' foil and precipitate united, as described; Fig. 3, a section through Fig. 2; Fig. 4, section showing precipitate on both sides of foil. Fig. 5 shows the united foil and precipitate folded. Fig. 6 is a plan View of ribbon; Fig. 7, an edge View of same.

Similar letters of reference indicate like parts in the several gures.

For filling dental cavities it is oftentimes necessary to employ gold-foil in various forms, consisting, essentially, of fold over fold or layer upon layer of foil, so that each insertion of gold in the cavity will consist of as much gold-as can be readily and effectually worked by the plugginginstrument, and the dental foil for this purpose is frequentlyy folded over and over and then cut off to the required shape and quantity; or the foil is in many ways too numerous to mention, but well known, prepared for the dentists use, the object in each instance being to supply to the dentist the foil in such shape and condition as will enable him to easily insert and work it in the dental cavity, advantage being taken of the well-known adhesive property of pure gold when it is heated in most instances.

To meet the several requirements of a good and simple preparation of gold for dental purposes I first make a foundation, so to speak, A, of pure gold-foil of any desired weight and size. I next dissolve pure gold in aqua regia and precipitate the gold in solution, and this precipitate, which consists ofv finely-divided brown spongy particles, is next crumbled prac- (No model.)

into cylinders or pellets or cakes, or any other well-known convenient form of dental gold. It is obvious that after one side of the foil has been covered withadhering particles the other side ofthe foil may be covered in like manner, if desired.

I do not wish to limit myself to the use of gold precipitate that is produced by any particular process; and therefore when gold is dissolved and again separat-ed from its solvent, Whether by means, of another liquor poured into the solution or by electro-chemical action or evaporation, or otherwise, and united to a piece of gold-foil by heat, in the manner described, the product is deemed to be within the scope of my invention.

The advantages derived from this preparation of dental gold are the readiness with which it is made, the cleanliness of the operation which insures purity of the gold, and the still `greater advantage arising from the fact that the gold particles scattered and adhering to the surface of the foil, as described,add materially to the substance of the foil, but in no wise detract from' its perfect ductility, the result being that dental gold prepared in this way, when it is pressed into a cavity, hasa greater tendency to spread laterally than is ordinarily the case,and it thus facilitates the operation of iilling the cavity. y

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

As a new article of manufacture, gold-foil and gold precipitate united by heat,as and for the purpose described.

RICHD. S. VILIIIAMS.

In presence of SAMUEL EMBERsoN, GEO. W. BUSH. 

